A highfalutin' term for making shit up. Throwing one of those around could land yourself in Internet court.
Before saying that an opinion is a fact please consult the following source and consider it's message before using phrases like "it's a fact" as an order to us for subscribing to your opinions. This sentence = not fact, just opinion, lulz points deducted.
[1] It would do well to remind internet pundits the difference between a fact and an opinion.